Unistrand telephone cable unistrand z183 telephone cable 6 cores 105mm conductor stranding tinned copper conductor material 025a current rating 80vac voltage rating white on blue blue on white white on orange orange on white white on green green on white primary insulation colour 44mm cable diameter pvc jacket material bt cw1308 standards 978rkm conductor resistance 500pf capacitance circular profile designed for use in telephone systems supplied in reel of 100m unist